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Alkali oxide-tantalum, niobium and antimony oxide ionic conductorsThe phase equilibrium relations of four systems were investigated in detail. These consisted of sodium and potassium antimonates with antimony oxide and tantalum and niobium oxide with rubidium oxide as far as the ratio 4Rb2O:llB2O5 (B=Nb, Ta). The ternary system NaSbO3-Sb2O4-NaF was investigated extensively to determine the actual composition of the body centered cubic sodium antimonate. Various other binary and ternary oxide systems involving alkali oxides were examined in lesser detail. The phases synthesized were screened by ion exchange methods to determine mobility of the mobility of the alkali ion within the niobium, tantalum or antimony oxide (fluoride) structural framework. Five structure types warranted further investigation; these structure types are (1) hexagonal tungsten bronze (HTB), (2) pyrochlore, (3) the hybrid HTB-pyrochlore hexagonal ordered phases, (4) body centered cubic antimonates and (5) 2K2O:3Nb2O5. Although all of these phases exhibit good ion exchange properties only the pyrochlore was prepared with Na(+) ions as an equilibrium phase and as a low porosity ceramic. Sb(+3) in the channel interferes with ionic conductivity in this case, although relatively good ionic conductivity was found for the metastable Na(+) ion exchanged analogs of RbTa2O5F and KTaWO6 pyrochlore phases.
Document ID
19750023836
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Roth, R. S. (National Bureau of Standards Washington, DC, United States)
Brower, W. S. (National Bureau of Standards Washington, DC, United States)
Parker, H. S. (National Bureau of Standards Washington, DC, United States)
Minor, D. B. (National Bureau of Standards Washington, DC, United States)
Waring, J. L. (National Bureau of Standards Washington, DC, United States)
Date Acquired
September 3, 2013
Publication Date
April 1, 1975
Subject Category
Solid-State Physics
Report/Patent Number
NASA-CR-134869
NBSIR-75-754
Accession Number
75N31909
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-50821-C
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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